that would be all about your touch and technique on the instrument. Spending time with the instrument and finding how to create new sounds with it. That's a personal journey for which I don't think there is a clear cut lesson. If you want to find a way to make something sound a certain way, time and patience with the instrument will be the only thing that makes it happen.

Janek is right here about touch and technique. The player I have heard who comes nearest to this is my good friend Henry Thomas, playing with singer Sarah Jane Morris. He uses a Dean Performer fretless acoustic into Markbass amplification, but I believe much of it is down to his masterful and restrained technique. Check out her album 'Where It Hurts' to see what I mean - the opening track 'World To Win' is a good example.

I find that the combination of the aforementioned high action and the 'Hook" technique can really make you sound like a double bass player. Depending on your instrument, pluck roughly where the fretboard meets the bass with the full length of your first two knuckles on your first finger. Double bass players often use the same technique in a vertical position. If I get some time tonight, I'll make a quick video demonstrating what I mean.

Compression can help. I use my Markbass Compressore with the gain around 8 and the ratio around 4 to add some tubey goodness.